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Sinus tachycardia is a rapid heart rate with a normal rhythm, meaning that your heart continues to beat at normal intervals, just faster than normal. This happens in certain diseases but also in response to normal events and activities like exercise, stress and fear.
Sinus tachycardia is a common heart-rhythm disturbance, or arrhythmia, that rarely requires treatment. Sinus tachycardia is a normal, harmless elevation in the heart rate because of exercise, excitement, or fever.
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